Ada County (Boise)
December
Weather in Ada County for December 2025
Your guide to Ada County weather in December - trends and predictions
Ada County typically experiences moderate snowfall in December, with an average of 9 snowy days.
In general, the average temperature in Ada County at the beginning of December is 4.7 °F. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 2.3 °F by the end of December.
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Snow Forecast ❄️
Temperatures
More
20
Dry days
2
Rainy days
9
Snow days
3°/-2°
Temperatures
10 km/h
Avg max wind
76 %
Avg humidity
Ada County in December average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  5° | 2 5° | 3 5° | 4  6° | 5  3° | 6  3° | |
| 7 6° | 8  3° | 9  3° | 10  2° | 11 3° | 12  2° | 13  4° |
| 14  1° | 15 2° | 16  3° | 17 5° | 18 3° | 19 6° | 20  6° |
| 21 4° | 22 7° | 23 4° | 24 2° | 25 1° | 26 1° | 27 2° |
| 28 3° | 29 4° | 30 3° | 31 2° |
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Temperatures trend during December in Ada County
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 | Heavy snow | 5° /-2° | 3 mm | 2.6 cm | |
| Dec. 2 | Heavy snow | 5° /-2° | 15.4 mm | 10.4 cm | |
| Dec. 3 | Heavy snow | 5° /-1° | 33.5 mm | 3.9 cm | |
| Dec. 4 | Fog | 6° /-2° | 0 mm | 0 cm | |
| Dec. 5 | Freezing fog | 3° /-2° | 0 mm | 0 cm | |
| Dec. 6 | Light drizzle | 3° /-3° | 2.3 mm | 0 cm | |
| Dec. 7 | Light drizzle | 6° /-2° | 3.5 mm | 1.9 cm | |
| Dec. 8 | Light freezing rain | 3° /-2° | 1.2 mm | 1 cm | |
| Dec. 9 | Overcast | 3° /-4° | 0.1 mm | 0.1 cm | |
| Dec. 10 | Moderate snow | 2° /-5° | 1 mm | 0.2 cm | |
| Dec. 11 | Heavy snow | 3° /-1° | 5.1 mm | 0.2 cm | |
| Dec. 12 | Light snow | 2° /0° | 7 mm | 5.1 cm | |
| Dec. 13 | Sunny | 4° /-1° | 0 mm | 0 cm | |
| Dec. 14 | Patchy rain possible | 1° /-2° | 55 mm | 2.1 cm | |
| Dec. 15 | Sunny | 2° /-3° | 11.4 mm | 8.2 cm | |
| Dec. 16 | Partly cloudy | 3° /-2° | 11.2 mm | 7.7 cm | |
| Dec. 17 | Sunny | 5° /-1° | 16.8 mm | 9.7 cm | |
| Dec. 18 | Patchy rain possible | 3° /-1° | 0.1 mm | 0 cm | |
| Dec. 19 | Patchy light drizzle | 6° /-1° | 0.6 mm | 0 cm | |
| Dec. 20 | Cloudy | 6° /0° | 0 mm | 0 cm | |
| Dec. 21 | Partly cloudy | 4° /-2° | 0 mm | 0 cm | |
| Dec. 22 | Partly cloudy | 7° /-1° | 0.2 mm | 0 cm | |
| Dec. 23 | Sunny | 4° /-2° | 4.6 mm | 0 cm | |
| Dec. 24 | Overcast | 2° /-4° | 5.3 mm | 0 cm | |
| Dec. 25 | Overcast | 1° /-3° | 6.4 mm | 0 cm | |
| Dec. 26 | Heavy snow | 1° /-3° | 40.7 mm | 29.5 cm | |
| Dec. 27 | Partly cloudy | 2° /-3° | 13.3 mm | 5.1 cm | |
| Dec. 28 | Cloudy | 3° /-1° | 46.2 mm | 7.3 cm | |
| Dec. 29 | Partly cloudy | 4° /-1° | 22.1 mm | 0 cm | |
| Dec. 30 | Overcast | 3° /-1° | 0.9 mm | 0.7 cm | |
| Dec. 31 | Partly cloudy | 2° /-3° | 0 mm | 0 cm | |
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Important Notice
Our weather forecast for Ada County in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Ada County forecast closer to your planned date for the most up-to-date weather information.
Ada County in December - FAQ
What are the expected maximum and minimum temperatures in Ada County during December?
Brace for cold days with temperatures not exceeding 3° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Ada County during December?
Moderate rainfall is anticipated in Ada County during December, with a total of 74.9 mm spread over approximately 2 days. Considering plans for rainy days is advisable.
Will it snow in Ada County in December 2025?
Ada County experiences an average snowfall of 22.5 cm during December, occurring over 9 days.
What are the typical wind conditions in Ada County during December?
The average wind speed in Ada County during December is 10 km/h, suggesting breezy to windy conditions, depending on your activities.
Ada County snow forecast December 2025
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December rainfall patterns in Ada County
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